Chapter 8.1 - Recalculations

Last updated on 27 Jun 2016 10:23 (cf. Authors)

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Generally, improvement of the emission inventory is an ongoing task and triggers recalculations for all source categories and pollutants frequently.

Further information regarding recalculations (especially due to changes in methods or activity data)
can be found in the corresponding chapter of the National Inventory Report.

Possible reasons for Recalculations

Due to the ever ongoing efforts to improve the inventory, more or less broad recalculations become necessary with each new submission.

Possible reasons for recalculations are

  1. new (sub-)categories to be included in the inventory or dislocation of subcatagories within the inventory
  2. data (activity data & emission factors) for certain (sub-)categories available for the first time
  3. change of data sources (for activity data)
  4. use of new emission factors (due to: inquest, research projects, expert judgement etc.)
  5. improvement of methods used for calculating emissions
  6. outcome of ongoing review activities under both UNFCCC and UN ECE

etc.

All these changes can effect both several years of the inventory or the entire time series back to 1990 (PM: 1995), leading to more or less significant changes within the emission trends.

Declaration of Recalculations

Under UN FCCC reporting, parties have to comment any recalculations in any year leading to differences between latest and current submission for a given year or the time period or series. Thereby, highest attention is given to recalculations within base year and the most current year of the latest submission:

Recalculations in base year data

  • mostly rather small but of highest importance
  • mostly due to changed methods or emission factors used for entire time series
  • impact on basis of any evaluation

Recalculations in data of current year of the latest submission

  • mostly because of corrected activity data (especially in Energy Production) from actualized Energy Balances
  • also due to changed methods, emission factors, or data sources used
  • impact on the amount of emission reduction reported in latest submission

Recalculations under UN ECE

Within the IIR, Germany focusses on recalculations within 1990 (PM: 1995) and the most current year of the latest submission, giving a) the quantity (in absolute numbers and in %) of change for any recalculated emission and b) the reasons for the recalculations done.

Recalculations in current submission

Independend from the reasons for recalculations listed above, the present submission represents an exception as

  • it is the first reporting according to the new UN ECE NFR structure, which itself emergeed from the revised UNFCCC CRF structure,
  • going along with the implemetation of emission sources not yet considered.

Given this circumstances, a provision of qualitative and quantitative information and reasoning for the broad recalculations carried out appears not feasible.

Table 1: Overview of impact of recalculations on the level of National Totals
(For more detailed information please mouseclick the pollutant.)

for reporting year: 1990 (19951) Change 2013 Change
in NFR submission: 2015 2016 absolute relative 2015 2016 absolute relative
Main pollutants
NEC
Nitrogen Oxides - NOx (as NO2) [kt] 2,882.281 2,881.886 -0.395 -0.01% 1,269.182 1,272.410 3.228 0.25%
Non-Methane VOC - NMVOC [kt] 3,392.424 3,389.448 -2.977 -0.09% 1,138.241 1,110.346 -27.895 -2.45%
Sulfur Oxides - SOx (as SO2) [kt] 5,307.272 5,311.611 4.339 0.08% 416.214 410.425 -5.789 -1.39%
Ammonia - NH3 [kt] 792.328 792.928 0.600 0.08% 670.849 729.951 59.102 8.81%
Particulate Matter
Particles <2.5µm PM2.5 [kt] 190.492 192.615 2.123 1.11% 112.731 110.948 -1.782 -1.58%
Particles <10µm - PM10 [kt] 313.244 315.879 2.635 0.84% 228.339 226.477 -1.861 -0.82%
Total Suspended Particles - TSP [kt] 1,932.409 1,925.666 -6.743 -0.35% 347.955 346.056 -1.898 -0.55%
Black Carbon - BC [kt] NR NR
Other
Carbon Monoxide - CO [kt] 12,534.124 12,581.045 46.921 0.37% 3,088.887 3,120.732 31.846 1.03%
Heavy Metals
Priority HM
Lead - Pb [t] 2,130.283 2,069.737 -60.546 -2.84% 210.138 207.965 -2.173 -1.03%
Cadmium - Cd [t] 19.784 19.804 0.020 0.10% 7.376 6.864 -0.511 -6.93%
Mercury - Hg [t] 32.246 32.242 -0.004 -0.01% 10.257 9.535 -0.722 -7.04%
Other HM
Arsenic - As [t] 80.504 80.402 -0.102 -0.13% 5.296 5.322 0.026 0.49%
Chrome - Cr [t] 133.407 132.205 -1.202 -0.90% 56.934 57.275 0.341 0.60%
Copper - Cu [t] 1,746.520 1,712.442 -34.078 -1.95% 2,152.724 2,155.233 2.510 0.12%
Nickel - Ni [t] 281.542 279.303 -2.240 -0.80% 95.190 93.890 -1.299 -1.37%
Selenium - Se [t] 3.501 3.501 0.000 0.00% 3.539 3.540 0.001 0.03%
Zinc - Zn [t] 1,724.798 1,704.772 -20.026 -1.16% 1,996.734 2,000.610 3.877 0.19%
Persistent Organic Pollutants - POPs
Dioxines & Furanes - PCDD/F [g I-Teq] 749.706 749.707 0.001 0.0001% 65.145 65.652 0.507 0.78%
Polycyclic Organic Hydrocarbons - PAHs
Benzo(a)pyrene - B[a]P [t] 138.717 138.719 0.003 0.002% 28.397 29.794 1.397 4.92%
Benzo(b)fluoranthene - B[b]F [t] 3.183 3.185 0.001 0.04% 1.278 1.275 -0.003 -0.26%
Benzo(k)fluoranthene - B[k]F [t] 1.813 1.815 0.001 0.06% 0.946 0.941 -0.004 -0.47%
Indeno(1,2,3-c,d)pyrene - I[1,2,3-c,d]P [t] 1.305 1.306 0.001 0.09% 0.698 0.694 -0.004 -0.62%
Polycyclic Aromatic Hydrocarbons - PAH 1-4 [t] 377.540 377.546 0.006 0.002% 172.443 184.325 11.882 6.89%
Other POPs
Hexachlorobenzene - HCB [kg] 5,378 27,208 21,830 405.89% 3,473 7,470 3,998 115.12%
Polychlorinated Biphenyls - PCBs [kg] 1,680.414 1,680.414 0.000 0.00% 232.892 241.192 8.301 3.56%

Reasons overview

1. revision of activity data

  • NFR 1.A: updated NEB 2013
  • NFR 1.A.3.b: mileage data for recent years

2. revision of entire model

3. newly implemented EF

  • NFR 3

4. revision of emission factors

5. re-allocation of activity data and emissions

6. as an outcome of the ongoing review activities under both UNFCCC and UNECE
(see recalculations listed above: revisions marked with * occured due to review findings)

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